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Probing the vortex state ofPrRu4Sb12through muon spin rotation and relaxation
Adroja, D. T.,Hillier, A. D.,Park, J.-G.,Goremychkin, E. A.,McEwen, K. A.,Takeda, N.,Osborn, R.,Rainford, B. D.,Ibberson, R. M. American Physical Society 2005 Physical review. B, Condensed matter and materials Vol.72 No.18
Low-Temperature Anomaly of a Spin-Glass Type in Ferromagnetic R2Mo2O7 with R = Sm and Nd
조영훈,박제근,A.D. Hillier,김형찬,H.-C. Ri,박정환,S. H. Kilcoyne,Sh. Xu,Y. Moritomo 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We have studied the magnetic and thermodynamic properties and the muon spin relaxation of the ferromagnetic pyrochlore compounds R2Mo2O7 (where R = Sm and Nd). Apart from the al-ready known ferromagnetic transition due to Mo moment ordering, there is another low-temperature anomaly at 18.6 K for Sm2Mo2O7 and at 18 K for Nd2Mo2O7. This low-temperature anomaly is observed in all the measured properties and resembles a spin-glass transition. In the ferromagnetic phase, we also ¯nd that the ac susceptibility exhibits a strong frequency dependence, indicating that some sorts of spin-glass components coexist with the ferromagnetically ordered moments. This metastability of the ferromagnetic phase is also borne out by the unusual spin relaxation behav-ior seen in the muon spin-relaxation measurements. Our results demonstrate that ferromagnetic R2Mo2O7 has very complex spin dynamics, which consists at least of two competing components: the ferromagnetic and the spin-glass components. This competition is seen to exist from the fer-romagnetic transition down to the lowest measured temperature. With lowering temperature, thespin-glass component appears to gain in strength, at least in the time window of the bulk magne- tization experiment. We discuss possible origins for the unusual spin dynamics.
Luuk H.G.A. Hopman,Elizabeth Hillier,Yuchi Liu,Jesse Hamilton,Kady Fischer,Nicole Seiberlich,Matthias G. Friedrich 한국심초음파학회 2023 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.31 No.2
BACKGROUND: Cardiac magnetic resonance fingerprinting (cMRF) enables simultaneous mapping of myocardial T1 and T2 with very short acquisition times. Breathing maneuvers have been utilized as a vasoactive stress test to dynamically characterize myocardial tissue in vivo. We tested the feasibility of sequential, rapid cMRF acquisitions during breathing maneuvers to quantify myocardial T1 and T2 changes. METHODS: We measured T1 and T2 values using conventional T1 and T2-mapping techniques (modified look locker inversion [MOLLI] and T2-prepared balanced-steady state free precession), and a 15 heartbeat (15-hb) and rapid 5-hb cMRF sequence in a phantom and in 9 healthy volunteers. The cMRF5-hb sequence was also used to dynamically assess T1 and T2 changes over the course of a vasoactive combined breathing maneuver. RESULTS: In healthy volunteers, the mean myocardial T1 of the different mapping methodologies were: MOLLI 1,224 ± 81 ms, cMRF15-hb 1,359 ± 97 ms, and cMRF5-hb 1,357 ± 76 ms. The mean myocardial T2 measured with the conventional mapping technique was 41.7 ± 6.7 ms, while for cMRF15-hb 29.6 ± 5.8 ms and cMRF5-hb 30.5 ± 5.8 ms. T2 was reduced with vasoconstriction (post-hyperventilation compared to a baseline resting state) (30.15 ± 1.53 ms vs. 27.99 ± 2.07 ms, p = 0.02), while T1 did not change with hyperventilation. During the vasodilatory breath-hold, no significant change of myocardial T1 and T2 was observed. CONCLUSIONS: cMRF5-hb enables simultaneous mapping of myocardial T1 and T2, and may be used to track dynamic changes of myocardial T1 and T2 during vasoactive combined breathing maneuvers.
Zero-Field Ambient-Pressure Quantum Criticality in the Stoichiometric Non-Fermi Liquid System CeRhBi
Anand, Vivek K.,Adroja, Devashibhai T.,Hillier, Adrian D.,Shigetoh, Keisuke,Takabatake, Toshiro,Park, Je-Geun,McEwen, Keith A.,Pixley, Jedediah H.,Si, Qimiao Physical Society of Japan 2018 Journal of the Physical Society of Japan Vol.87 No.6
Single Sensor Gait Analysis to Detect Diabetic Peripheral Neuropathy: A Proof of Principle Study
Patrick Esser,Johnny Collett,Kevin Maynard,Dax Steins,Angela Hillier,Jodie Buckingham,Garry D. Tan,Laurie King,Helen Dawes 대한당뇨병학회 2018 Diabetes and Metabolism Journal Vol.42 No.1
This study explored the potential utility of gait analysis using a single sensor unit (inertial measurement unit [IMU]) as a simple tool to detect peripheral neuropathy in people with diabetes. Seventeen people (14 men) aged 63±9 years (mean±SD) with diabetic peripheral neuropathy performed a 10-m walk test instrumented with an IMU on the lower back. Compared to a reference healthy control data set (matched by gender, age, and body mass index) both spatiotemporal and gait control variables were different between groups, with walking speed, step time, and SDa (gait control parameter) demonstrating good discriminatory power (receiver operating characteristic area under the curve >0.8). These results provide a proof of principle of this relatively simple approach which, when applied in clinical practice, can detect a signal from those with known diabetes peripheral neuropathy. The technology has the potential to be used both routinely in the clinic and for tele-health applications. Further research should focus on investigating its efficacy as an early indicator of or effectiveness of the management of peripheral neuropathy. This could support the development of interventions to prevent complications such as foot ulceration or Charcot’s foot.